Aetherflux Reservoir + Cloudstone Curio + Defiler of Vigor

Aetherflux Reservoir

Cloudstone Curio

Defiler of Vigor

How it works

1. Cast the green permanent card in your hand by paying 2 life.
2. Defiler of Vigor and Aetherflux Reservoir triggers.
3. Resolve the Defiler of Vigor trigger, putting a +1/+1 counter on each creature you control.
4. Resolve the Aetherflux Reservoir trigger, causing you to gain 1 life for each spell you've cast before it this turn.
5. The green permanent enters the battlefield, triggering Cloudstone Curio, returning another nontoken nonartifact green permanent with mana cost from the battlefield to your hand.
6. Repeat.
7. Once you have infinite life, you may activate Aetherflux Reservoir infinite times to deal infinite damage to any target(s).